| 摘要 |
The electric lamp has a lamp vessel (1) having an axis of symmetry (2) and a window (9). The lamp vessel has a first mirrored paraboloidal wall portion (5) remote from the window and a second mirrored wall portion (7) near the window. The second portion (7) is curved according to a branch (15) of a parabola, the axis (16) of which includes a sharp angle alpha with the axis (2) of the lamp vessel and the focus (8) of which coincides there with. The focus (8) is spaced from the focus (6) of the first wall portion (5). A cylindrical light source (10) is axially disposed in the lamp vessel (1) coincident with said foci (6,8). The lamp generates a wide beam and nevertheless has sizes which are normal for reflector lamps.
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